Carborundum composition.



comma R PLASTIC.

JOSEPH. MONTCOCOL, F PARIS, FRANCE.

ARBOBUNIDUM COMPOSITION.

No Drawing.

Specification of Letters Patent.

Application filed November 5, 1910. Serial No. 590,857.

Patented Mar. 18, 1913.

To all whom it may concern:

Be it known that we, LUCIEN SunMoN'r and JosnrH Monroocon, citizens of the Republic of France, and residing at Paris,

France, have invented certain new and useful Improvements in Compositions Made of a Mixture of Carborundum with a Binding Agent, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to carry out the same.

The present invention has for its object a composition made of a mixture of carborundum with a binding agent used for agglomerating the same.

This composition is specially intended to form all kind of areas such as roadways,

idewalks, slakflgqring, stair steps, and the like. T'li'as already been proposed to mix carborundum with cement hme as halt saw dust and other binding materialg to make these harder and more resisting to wear than they would be when used as such. But after a long study and numerous trials we have found that good results can only be obtained when the carborundum is mixed with the binding agent in proper proportions. Should the carborundum be used in insuflicient quantities, the binding agent which fills the space between the carborundum grains is soon worn out (for instance through walking thereon) when the composition is used to make slabs, stairsteps and. the like, and then hollows areformed between the grains while the latter project out and are so hard that it becomes impossible to walk thereon. On the other hand should the carborundum be used in too large quantities, the grains will not be sufficiently embedded in the binding and are soon partially or completely, detached by friction, whereby the area is again made unfit for use.

We have found that to attain good results the volume occupied by the carborundum in the concrete when manufacture an set in position for use must be nearly the same as i that occupied by the bindin agent. Start- 50 ing from these data we ave found that for constituting an area or slabfloor formed oors with a mixture of cement and carborundum the carborundum should be embedded in the cement in the proportion of one part by volume of cement for an equal volume of carilgorundum. iIhe carboruixlidiilm should b3 rst intimate mixed wit t e c ment an then diluted w dth the quantity of water required to effect the binding of the cement and spread and smoothed by means of a trowel. It will be obvious that more or less cement can be used according to the size of the carborundum grains; but the mentioned proportions should not be practically departed from if good results are to be secured. It is necessary that the volume of the carborundum should be the same as of the cement.

When slabs are manufactured from a mixture of carborundum and cement by the dry. process by means of an hydraulic press and are subjected 'to a pressure of 150 kilogr. per square centimeter, it has been found that owing to the pressure on the cement the volume of which is reduced to about the half, one part b volume of carborundum should be origina 1y used for wo ar 0 cement.

If asphalt is used instea of cement, one part by volume of carborundum for four parts of cement w ave e used and thoroughly mixed before compressing, owing to the compressibility of asphalt.

For floors the cement or asphalt may be replaced by with ma nesium chlorid as an agg u mating agen Uwmg t5 the compresslon of sawdust or cork one part by volume of carborundum will have to be employed for ree par s 0 ese varlous examples mentloned 1t will be noticed that the proportions between carborundum and binding agent have always been determined in such a manner that when the composition is applied for use, the volume occupied by the carborundum is ract-ically the same as that occupied by the inding agent in order that the less hard bindin agent should not release the car-.. borun um and should not produce a rough surface the projecting parts of which would be carborundum grams.

Having thus described and ascertained the nature of our invention and in what manner the same is to be performed, whatwe now claim as novel is:

1. A aving area composed of an inti- 5 mate mixture of granulated carborundum and a tough and resistant binding agent in equal volumetric proportions.

2. A paving area composed of a compressed mixture of granulated carborundum 10 and a resistant compressible binding agent in such proportions that after compression said carborundum and said binding agent shall occupy substantially equal volumes.

In witness whereof we havehereunto set our hands in the presence of two witnesses.

LUCIEX SURMOXT. JOSEPH MOXTCOCOL.

'itnesses FRANQOIS DU BOISCO'CRCAY,

H. 0. Com.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

